Method for reducing overflow of coiled inner ring of cold tandem mill

Abstract

The invention relates to a method for reducing overflow of a coiled inner ring of a cold tandem mill. The method comprises the following steps of 1, conducting roller system adjustment and deviation control adjustment before a rolling process; 2, controlling and optimizing a head shape of strip steel in the rolling process to ensure that the head of the strip steel is straight and enters a coiling machine; 3, reasonably optimizing the pilot rate of the coiling machine in the rolling process, so that the strip steel smoothly enters a wrapper; 4, after successful shearing and threading in the rolling process, optimizing tension control of the coiling machine, and reducing tension fluctuation; 5, adjusting and controlling a wrap angle between a lower holding arm of the wrapper and a winding drum in the rolling process, ensuring entering along a tangent line and ensuring a large wrap angle; and 6, conducting overflow confirmation after the rolling process. According to the scheme, the times and the degree of overflow of the inner ring of an outlet are reduced, the defects of tower shapes, wrinkles and the like caused by overflow of the inner ring are avoided, the repair amount and the waste reduction are reduced, stable and smooth production is guaranteed, and the yield is increased.

Description

technical field [0001] The invention relates to a method, in particular to a method for reducing the overflow of the coil inner ring of a cold tandem rolling mill, and belongs to the field of metal material pressure processing. Background technique [0002] In recent years, as most users have shifted from low-end to high-end, higher and higher requirements have been put forward for the surface and coil quality of strip steel. If there are too many overflow circles, it will directly lead to product degradation. The overflow amount of the inner ring of the steel coil is ≤ 6mm, which is considered the maximum acceptable range, but when the site is serious, the overflow amount reaches 15mm, and the number of overflow turns is nearly 20 turns, which cannot meet the requirements of the takeaway roll for the shape of the roll. Therefore, in view of the phenomenon of overflow of the inner ring of steel coils in different degrees during the coiling process, through the study of the m...

AI Technical Summary

Problems solved by technology

[0004] One is that the shape and position tolerance deviation of the roll system is relatively large, and the strip loses tension and deviates after being cut;

[0005] The second is that there is a deviation and the control of the plate shape is not good. When the strip steel is divided into coils, the leader will deviate before entering the coiler;

[0007] Fourth, there are bad conditions in the export plate shape of the rolling mill;

[0009] 1) The distance from the exit of the F5 frame to the 1# coiling position is 9.5m, which is the longest exit section in China. It is difficult for the leader to move forward along the center line of the unit at such a long distance under the state of loss of tension, and the thin strip steel is more easy to deviate;

[0010] 2) After the strip is cut off, the tension is lost instantly, and the head of the next roll has not yet reached the magnetic belt. At this time, it is completely driven by the pinch roller, and when the lower roller of the pinch roller is rising, the two ends cannot be completely synchronized, and the reaction Although the strip is pinched but the pinching force is uneven, the strip head will always have a slight lateral deviation;

[0011] 3) The wrapping angle between the original design of the coiler and the coiler drum is too small. When the second round of coiling starts, the thick tape head is relatively "hard" and will not be twisted, and can smoothly enter the drum for coiling , but there is a problem with the "soft" thin tape head. Before the second coiling, the twist has occurred between the lower arm and the reel. During the coiling process, it will continue to accumulate here. After a certain degree , the difference in thickness on both sides will lead to deviation;

[0012] 4) It is difficult to control the angle of the strip steel entering the coiler. If the angle is not accurate, the strip will be offset and overflow when the strip enters the coiler. Therefore, it is necessary to ensure that the strip enters the drum along the tangent of the outer circle of the drum. A sufficiently large wrap angle is formed between the winder and the reel

[0013] 5) For the adjustment of the roller system, it was only considered from the perspective of the single equipment itself, ignoring the internal and close relationship between each other;

[0014] 6) The traditional plate type control technology makes the export plate shape of F5 frame not all good;

In addition, 201721575840.6 "Protective device for overflowing edge of cold-rolled strip coiling", 201520688030.6 "A device for preventing overflowing edge of strip coiling" and 201611105898.4 "Control device for preventing tower-shaped unloading" are all on the single Corresponding improvements have been made on the equipment to meet the formation of local overflow edges, instead of considering the operation coordination between various devices from a global perspective, or fully relying on online detection and control models, many times there will be operating speed caused by equipment degradation and insufficient precision Mismatch, inaccurate position accuracy, unreasonable, out-of-tolerance behavior, etc.

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